Quick Fix: To resolve this issue, you can use the "html-bundler-webpack-plugin". It allows you to directly specify the source JS file path within the HTML, and the plugin will compile and bundle the necessary JavaScript and CSS files.
The Problem:
A developer is using webpack as a module bundler, React for the frontend, and Node.js for the backend. They are encountering an error in the console that says, "Failed to load module script: Expected a JavaScript module script but the server responded with a MIME type of "text/html". Strict MIME type checking is enforced for module scripts per HTML spec.". The code they provided includes a webpack configuration and an HTML file with a script tag. They have tried changing the script type to "text/javascript" but that didn’t render anything and still didn’t resolve the error. They are seeking assistance in resolving this issue.
The Solutions:
Solution 1: Use the “html-bundler-webpack-plugin” to compile source files directly in HTML
Install the Plugin:
Using npm install html-bundler-webpack-plugin --save-dev, install the html-bundler-webpack-plugin.
Specify Source JS File in HTML:
Modify the HTML file and specify the source JS file using a relative path to the HTML file. For example:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
<!-- specify source JS file using a relative path to the HTML file -->
<script type="module" src="./App/Main/index.jsx"></script>
</head>
<body></body>
</html>
Add Plugin to Webpack Config:
Add the html-bundler-webpack-plugin to the webpack configuration. For example:
import HtmlBundlerPlugin from 'html-bundler-webpack-plugin';
export default {
output: {
path: path.resolve('./dist'),
},
mode: 'production',
plugins: [
new HtmlBundlerPlugin({
entry: {
// define templates here
index: './App/index.html', // <= path to HTML file
},
js: {
// output filename of compiled JavaScript
filename: 'js/[name].[contenthash:8].js',
},
css: {
// output filename of extracted CSS
filename: 'css/[name].[contenthash:8].css',
//inline: true, // inlines CSS into HTML
},
}),
],
// ... other webpack config
};
Run Webpack:
Run webpack to generate the compiled HTML file. For example, use webpack or webpack --mode production to build the production version.
Output:
The generated HTML file will be placed in the specified output.path directory, with compiled JS and CSS files referenced in the <head> section.
Q&A
How to solve error-Failed to load module script: Expected a JavaScript module script?
—
You can use the "html-bundler-webpack-plugin" to compile style, script, images source files used in HTML.
How to add html-bundler-webpack-plugin to webpack config?
—
Add the plugin to webpack config, write the js, css output filename here.
How to write the entrypoint.html file?
—
Add the plugin to webpack config, write the js, css output filename here.
Video Explanation:
The following video, titled "How to fix Unexpected Token in JSON error (for web developers ...", provides additional insights and in-depth exploration related to the topics discussed in this post.
This video provides further insights and detailed explanations related to the content discussed in the article.
